send HTTPREQUEST from a website to a arduino

I've recently made a similar project with a Raspberry Pi. But this doesn't make a difference.

First be careful with my solution. Anybody can join on your device, if they have your IP and Port. It might be not the best solution, but it works pretty good.

So what I did is, I've set a DynDNS to my router, so that I doesn't have to change the IP in my script every time. You can get a DynDNS from your provider or you can use the free service No-IP. Next I set a static local IP adress to my arduino/pi via the settings on my router. Then I also set port-forwarding to the arduino/pi.

Then you should be able to access your arduino/pi via the internet. And if you have this, you can also control it via any website you want.

To accomplish an HTTP request in PHP, there will be a lot of possible solutions. But I prefer this:

$response = file_get_contents(YOUR_DYNDNSIP_AND_PORT)

https://www.w3schools.com/php/func_filesystem_file_get_contents.asp

You also can additionally can get a response via this function.

To protect your own network, you can use HTTP Basic Authentication, which you have to add a username and a password to the request. This make it difficulter to access your arduino.

I hope this might help you.